Alert rule Apply To (Tag) display fix

The Apply To (Tag) is set to {All} when creating a rule but when editing a rule it's blank. Fixed display issue so it shows as {All} when editing.
trimble-oss#1186

DBADashGUI/DBADashAlerts/Rules/AlertRuleBase.cs

@@ -212,7 +212,7 @@ public static AlertRuleBase GetRule(int ruleID, RuleTypes ruleType, short priori
             };
             rule.RuleID = ruleID;
             rule.Priority = (Alert.Priorities)priority;
-            rule.ApplyToTag = applyToTagID <= 0 ? null : new DBADashTag()
+            rule.ApplyToTag = applyToTagID <= 0 ? DBADashTag.AllInstancesTag() : new DBADashTag()
             { TagID = applyToTagID, TagName = applyToTag.Split(":")[0], TagValue = applyToTag.Split(":")[1] };
             rule.EvaluationPeriodMins = evaluationPeriodMins;
             rule.IsActive = isActive;